<template>
  <div class="top-right-btn" :style="style">
    <el-row>
      <el-tooltip class="item" effect="dark" :content="showSearch ? '隐藏搜索' : '显示搜索'" placement="top" v-if="search">
        <el-button circle icon="Search" @click="toggleSearch()" />
      </el-tooltip>
      <el-tooltip class="item" effect="dark" content="刷新" placement="top">
        <el-button circle icon="Refresh" @click="refresh()" />
      </el-tooltip>
      <el-tooltip class="item" effect="dark" content="显隐列" placement="top" v-if="columns">
        <el-button circle icon="Menu" @click="showColumn()" v-if="showColumnsType == 'transfer'" />
        <el-dropdown trigger="click" :hide-on-click="false" style="padding-left: 12px" v-if="showColumnsType == 'checkbox'">
          <el-button circle icon="Menu" />
          <template #dropdown>
            <el-dropdown-menu>
              <template v-for="item in columns" :key="item.key">
                <el-dropdown-item>
                  <el-checkbox :checked="item.visible" @change="checkboxChange($event, item.label)" :label="item.label" />
                </el-dropdown-item>
              </template>
            </el-dropdown-menu>
          </template>
        </el-dropdown>
      </el-tooltip>
    </el-row>
    <el-dialog :title="title" v-model="open" append-to-body>
      <el-transfer :titles="['显示', '隐藏']" v-model="value" :data="columns" @change="dataChange" />
    </el-dialog>
  </div>
</template>

<script setup>
  const props = defineProps({
    /* 是否显示检索条件 */
    showSearch: {
      type: Boolean,
      default: true
    },
    /* 显隐列信息 */
    columns: {
      type: Array
    },
    /* 是否显示检索图标 */
    search: {
      type: Boolean,
      default: true
    },
    /* 显隐列类型（transfer穿梭框、checkbox复选框） */
    showColumnsType: {
      type: String,
      default: 'checkbox'
    },
    /* 右外边距 */
    gutter: {
      type: Number,
      default: 10
    }
  });

  const emits = defineEmits(['update:showSearch', 'queryTable']);

  // 显隐数据
  const value = ref([]);
  // 弹出层标题
  const title = ref('显示/隐藏');
  // 是否显示弹出层
  const open = ref(false);

  const style = computed(() => {
    const ret = {};
    if (props.gutter) {
      ret.marginRight = `${props.gutter / 2}px`;
    }
    return ret;
  });

  // 搜索
  function toggleSearch() {
    emits('update:showSearch', !props.showSearch);
  }

  // 刷新
  function refresh() {
    emits('queryTable');
  }

  // 右侧列表元素变化
  function dataChange(data) {
    for (let item in props.columns) {
      const key = props.columns[item].key;
      props.columns[item].visible = !data.includes(key);
    }
  }

  // 打开显隐列dialog
  function showColumn() {
    open.value = true;
  }

  if (props.showColumnsType == 'transfer') {
    // 显隐列初始默认隐藏列
    for (let item in props.columns) {
      if (props.columns[item].visible === false) {
        value.value.push(parseInt(item));
      }
    }
  }

  // 勾选
  function checkboxChange(event, label) {
    props.columns.filter((item) => item.label == label)[0].visible = event;
  }
</script>

<style lang="scss" scoped>
  :deep(.el-transfer__button) {
    border-radius: 50%;
    display: block;
    margin-left: 0px;
  }
  :deep(.el-transfer__button:first-child) {
    margin-bottom: 10px;
  }
  :deep(.el-dropdown-menu__item) {
    line-height: 30px;
    padding: 0 17px;
  }
</style>
